VexFlow クレシェンド・デクレシェンド

VexFlow 使い方に戻る。

概要

　クレシェンドやデクレシェンドもTextDynamics同様、音の長さの概念をもった仕組みを利用しますので、またVoiceクラスやFormatterクラスのお世話になるややこしさがあります。なんかいろいろ頑張ったんすけど、1小節目の位置からクレシェンドが描かれてしまってギブアップです。なんで？って感じ。4拍目だけまともに描けるのも、またミソだね。嫌になってきたから、このクレシェンドはもう使わねぇって決めたね。使わねぇ。何だコレだね。

　

クレシェンド・デクレシェンド

　コードは以下のとおりです。

<div id="yonet202403Mid_Output01"></div>
<script>
class Position {
  constructor(x, y) {
    this.x = x;
    this.y = y;
  }
}
var VF = Vex.Flow;
const Instrument1 = new Position(0, 0);
const Instrument2 = new Position(0, 0);
(function(){
const {
  Factory,
  Stave,
  StaveNote,
  Formatter,
  Voice,
  StaveTie,
  BarLine,
  StaveConnector,
  Modifier,
  RenderContext,
  TextDynamics,
  Articulation,
  Renderer
} = Vex.Flow;

let nscale = 0.64;
let nwidth = 1040;
let nheight = 720;

let nHeadMargin = 70;
let nStaveWidth = 350;

const f = new Factory({ 
  renderer: { elementId: 'yonet202403Mid_Output01', width: nwidth, height: nheight * nscale }
  });
const ctx = f.getContext();
ctx.scale(nscale, nscale);

const defaultStyle = {
  lineWidth: ctx.lineWidth,
  strokeStyle: ctx.strokeStyle,
};



for (let i = 0; i <= nwidth * (1 / nscale); i += 10) {
  ctx.beginPath();
  ctx.moveTo(0 + i, 0);
  ctx.lineTo(0 + i, nheight);
  if (i % 100 === 0){
    ctx.setLineWidth(1);
    ctx.setStrokeStyle('rgba(200, 200, 200, 0.8)');
  }
  else{
    ctx.setLineWidth(0.5);
    ctx.setStrokeStyle('rgba(230, 230, 230, 0.8)');
  }
  ctx.stroke();
}

for (let i = 0; i <= nheight; i += 10) {
  ctx.beginPath();
  ctx.moveTo(0, i);
  ctx.lineTo(nwidth * (1 / nscale), i);
  if (i % 100 === 0){
    ctx.setLineWidth(1);
    ctx.setStrokeStyle('rgba(200, 200, 200, 0.8)');
  }
  else{
    ctx.setLineWidth(0.5);
    ctx.setStrokeStyle('rgba(230, 230, 230, 0.8)');
  }
  ctx.stroke();
}

ctx.lineWidth = defaultStyle.lineWidth;
ctx.strokeStyle = defaultStyle.strokeStyle;

const stave1 = new Stave(80, 150, nHeadMargin + nStaveWidth).setContext(ctx);
stave1.setClef("treble").setContext(ctx);
stave1.setTimeSignature('4/4').setContext(ctx);
stave1.setSection("A", 0);
stave1.setMeasure(1);
stave1.setTempo({ duration: "q", dots: 0, bpm: 120 }, 0);
stave1.setBegBarType(VF.Barline.type.REPEAT_BEGIN);//BarLine.type.REPEAT_BEGIN

Instrument1.x = stave1.x - 30;
Instrument1.y = stave1.y + 90; 

stave1.draw();

const notes1 = [
  new StaveNote({ keys: ["d/5"], duration: "8", stem_direction: -1 }),
  new StaveNote({ keys: ["e/5"], duration: "8", stem_direction: -1 }),
  new StaveNote({ keys: ["f/5"], duration: "8", stem_direction: -1 }),
  new StaveNote({ keys: ["g/5"], duration: "8", stem_direction: -1 }),
  new StaveNote({ keys: ["a/5"], duration: "8", stem_direction: -1 }),
  new StaveNote({ keys: ["b/5"], duration: "8", stem_direction: -1 }),
  new StaveNote({ keys: ["c/6"], duration: "8", stem_direction: -1 }),
  new StaveNote({ keys: ["d/6"], duration: "8", stem_direction: -1 }),
];
//ここで各ノートに指定したアーティキュレーションを追加
notes1[0].addModifier(new VF.Articulation('a.').setPosition(3));
notes1[1].addModifier(new VF.Articulation('av').setPosition(3));
notes1[2].addModifier(new VF.Articulation('a>').setPosition(3));
notes1[3].addModifier(new VF.Articulation('a^').setPosition(3));
notes1[4].addModifier(new VF.Articulation('a-').setPosition(3));
notes1[5].addModifier(new VF.Articulation('a+').setPosition(3));
notes1[6].addModifier(new VF.Articulation('ao').setPosition(3));
notes1[7].addModifier(new VF.Articulation('a|').setPosition(3));

Formatter.FormatAndDraw(ctx, stave1, notes1);

var stave2 = new Vex.Flow.Stave(stave1.width + stave1.x, stave1.y, nStaveWidth);
var stave1002 = new Vex.Flow.Stave(stave1.width + stave1.x, stave1.y + 120, 0);
stave2.setEndBarType(VF.Barline.type.REPEAT_BOTH);
stave2.setMeasure(2);
stave2.setTempo({ name: "Andante", note: "8", bpm: 120 }, 0);
stave2.setContext(ctx).draw();

var note2_1 = new Vex.Flow.StaveNote({ keys: ["F/4"], duration: "8" });
var note2_2 = new Vex.Flow.StaveNote({ keys: ["C/5"], duration: "8", stem_direction: -1 });
var note2_3 = new Vex.Flow.StaveNote({ keys: ["D/4"], duration: "8" });
var note2_4 = new Vex.Flow.StaveNote({ keys: ["C/4"], duration: "8" });
var note2_5 = new Vex.Flow.StaveNote({ keys: ["B/3"], duration: "8" });
var note2_6 = new Vex.Flow.StaveNote({ keys: ["A/3"], duration: "8" });
var note2_7 = new Vex.Flow.StaveNote({ keys: ["G/3"], duration: "8" });
var note2_8 = new Vex.Flow.StaveNote({ keys: ["F/3"], duration: "8" });

//ここで各ノートに指定したアーティキュレーションを追加
note2_1.addModifier(new VF.Articulation('am').setPosition(4));
note2_2.addModifier(new VF.Articulation('a@a').setPosition(3));
note2_3.addModifier(new VF.Articulation('a@u').setPosition(4));

var stave2Voice = new Vex.Flow.Voice({ num_beats: 4, beat_value: 4 });
stave2Voice.addTickables([note2_1, note2_2, note2_3, note2_4, note2_5, note2_6, note2_7, note2_8]);

var formatter2 = new Vex.Flow.Formatter().joinVoices([stave2Voice]);//.format([stave2Voice], nStaveWidth);
formatter2.formatToStave([stave2Voice], stave2);

stave2Voice.draw(ctx, stave2);

var Dynamics2_1 = new Vex.Flow.TextDynamics({ text: "sfz", duration: "2" });
var Dynamics2_3 = new Vex.Flow.TextDynamics({ text: "p", duration: "4" });
var Dynamics2_4 = new Vex.Flow.TextDynamics({ text: "f", duration: "4" });
var stave2VoiceDynamics = new Vex.Flow.Voice({ num_beats: 4, beat_value: 4 });
stave2VoiceDynamics.addTickables([Dynamics2_1, Dynamics2_3, Dynamics2_4]);


var Dynamics_formatter2 = new Vex.Flow.Formatter().joinVoices([stave2VoiceDynamics]);
Dynamics_formatter2.format([stave2VoiceDynamics], nStaveWidth);

stave2VoiceDynamics.draw(ctx, stave1002);


var note2_1_X = note2_1.getAbsoluteX();
var staveFrom1To4_Y = note2_1.getStave().getYForLine(2.5);

const stave3 = new Stave(stave2.width + stave2.x, stave1.y, nStaveWidth).setContext(ctx);
stave3.setEndBarType(VF.Barline.type.NONE);
stave3.setSection("B", 0);
stave3.setMeasure(3);
stave3.draw();


const stave4 = new Stave(stave3.width + stave3.x, stave1.y, nStaveWidth).setContext(ctx);
stave4.setBegBarType(VF.Barline.type.NONE);
stave4.setEndBarType(VF.Barline.type.REPEAT_END);
stave4.setMeasure(4);
stave4.draw();


const stave5 = new Stave(stave1.x, stave1.y + 200, nHeadMargin + nStaveWidth).setContext(ctx);
stave5.addClef("treble").setContext(ctx);
stave5.addTimeSignature('4/4').setContext(ctx);
stave5.setSection("C", 0);
stave5.setMeasure(5);
stave5.setEndBarType(VF.Barline.type.SINGLE);//規定値(省略可能)

stave5.draw();

var connector = new VF.StaveConnector(stave1, stave5);
connector.setType(VF.StaveConnector.type.SINGLE);
connector.setContext(ctx);
connector.draw();

const notes5 = [
  new StaveNote({ keys: ["a/4"], duration: "q" }),
  new StaveNote({ keys: ["b/4"], duration: "q" }),
  new StaveNote({ keys: ["c/5"], duration: "q" }),
  new StaveNote({ keys: ["d/5"], duration: "q" }),
];

Formatter.FormatAndDraw(ctx, stave5, notes5);

const tie3 = new StaveTie({
  first_note: notes5[1],
  last_note: notes5[2],
  first_indices: [0],
  last_indices: [0],
});

const tie4 = new StaveTie({
  first_note: notes5[2],
  last_note: notes5[3],
  first_indices: [0],
  last_indices: [0],
});

tie3.setContext(ctx).draw();
tie4.setContext(ctx).draw();

const stave6 = new Stave(stave5.width + stave5.x, stave5.y, nStaveWidth).setContext(ctx);
stave6.setEndBarType(VF.Barline.type.DOUBLE);
stave6.setMeasure(6);

stave6.draw();

const notes6 = [
  new StaveNote({ keys: ["e/5"], duration: "q", stem_direction: -1 }),
  new StaveNote({ keys: ["f/5"], duration: "q", stem_direction: -1 }),
  new StaveNote({ keys: ["g/5"], duration: "q", stem_direction: -1 }),
  new StaveNote({ keys: ["a/5"], duration: "q", stem_direction: -1 }),
];

Formatter.FormatAndDraw(ctx, stave6, notes6);

const tie5 = new StaveTie({
  first_note: notes5[3],
  last_note: notes6[0],
  first_indices: [0],
  last_indices: [0],
});

tie5.setContext(ctx).draw();


const stave7 = new Stave(stave6.width + stave6.x, stave5.y, nStaveWidth).setContext(ctx);
stave7.setMeasure(7);
stave7.draw();


const stave8 = new Stave(stave7.width + stave7.x, stave5.y, nStaveWidth).setContext(ctx);
stave8.setMeasure(8);
stave8.draw();


const stave9 = new Stave(stave5.x, stave5.y + 200, nHeadMargin + nStaveWidth).setContext(ctx);
stave9.setMeasure(9);
stave9.draw();

var connector9 = new VF.StaveConnector(stave5, stave9);
connector9.setType(VF.StaveConnector.type.SINGLE);
connector9.setContext(ctx);
connector9.draw();

var connector9_2 = new VF.StaveConnector(stave5, stave9);
connector9_2.setType(VF.StaveConnector.type.BRACKET);
connector9_2.setContext(ctx);
connector9_2.draw();

Instrument2.x = stave1.x - 30;
Instrument2.y = stave5.y + ((stave9.y - stave5.y) / 2) + 90; 


const stave10 = new Stave(stave9.width + stave9.x, stave9.y, nStaveWidth).setContext(ctx);
stave10.setMeasure(10);
stave10.draw();


const stave11 = new Stave(stave10.width + stave10.x, stave9.y, nStaveWidth).setContext(ctx);
stave11.setMeasure(11);
stave11.draw();


const stave12 = new Stave(stave11.width + stave11.x, stave9.y, nStaveWidth).setContext(ctx);
stave12.setMeasure(12);
stave12.draw();

})();

const svgElement2 = document.querySelector('#yonet202403Mid_Output01 svg');
svgElement2.style.backgroundColor = '#F5F5F5';

var svgContainer = document.getElementById('yonet202403Mid_Output01');

var svgElement = svgContainer.querySelector('svg');

var newText = document.createElementNS('http://www.w3.org/2000/svg', 'text');
newText.setAttribute('x', '100');
newText.setAttribute('y', '100');
newText.setAttribute('font-family', 'Hiragino Kaku Gothic Pro, メイリオ, MS Gothic, sans-serif');
newText.setAttribute('font-size', '50');
newText.setAttribute('fill', 'black');
newText.textContent = 'TestTitle - subTitle - lyrics: yo-net, music: yo-net';

svgElement.appendChild(newText);


var newText2 = document.createElementNS('http://www.w3.org/2000/svg', 'text');
newText2.setAttribute('x', Instrument1.x);
newText2.setAttribute('y', Instrument1.y);
newText2.setAttribute('font-family', 'Bravura, VexFlow, Arial, sans-serif');
newText2.setAttribute('font-size', '20pt');
newText2.setAttribute('fill', 'black');
newText2.textContent = 'Vocal';

var textGroup2 = document.createElementNS('http://www.w3.org/2000/svg', 'g');
textGroup2.setAttribute('transform', 'rotate(-90 ' + Instrument1.x + ' ' + Instrument1.y + ')');

textGroup2.appendChild(newText2);

svgElement.appendChild(textGroup2);

var newText3 = document.createElementNS('http://www.w3.org/2000/svg', 'text');
newText3.setAttribute('x', Instrument2.x);
newText3.setAttribute('y', Instrument2.y);
newText3.setAttribute('font-family', 'Bravura, VexFlow, Arial, sans-serif');
newText3.setAttribute('font-size', '20pt');
newText3.setAttribute('fill', 'black');
newText3.textContent = 'E.Guitar';

var textGroup3 = document.createElementNS('http://www.w3.org/2000/svg', 'g');
textGroup3.setAttribute('transform', 'rotate(-90 ' + Instrument2.x + ' ' + Instrument2.y + ')');

textGroup3.appendChild(newText3);

svgElement.appendChild(textGroup3);
</script>

　できたね。音符を定義したところに例えば、notes1というオブジェクトにノートの配列を保持している場合は

const notes1 = [

　new StaveNote({ keys: ["d/5"], duration: "8", stem_direction: -1 }),

　省略

　new StaveNote({ keys: ["d/6"], duration: "8", stem_direction: -1 }),

];

　に対しては

notes1[0].addModifier(new VF.Articulation('a.').setPosition(3));

　のようにして、addModifier関数を呼び出し、

var note2_1 = new Vex.Flow.StaveNote({ keys: ["F/4"], duration: "8" });

　のように定義されたノートには

note2_1.addModifier(new VF.Articulation('a.').setPosition(3));

　のように定義して、addModifier関数を呼び出します。

第一引数：Articurationクラスのコンストラクタと、その下のsetPositionのコンストラクタにも引数を定義します。

　Articurationの

第一引数：冒頭で紹介したコードを付与します。

　setPositionの

第一引数：3なら音符の上なので、通常はノート作成の際 , stem_direction: -1 と定義した音符に3を指定します。4なら音符の下にアーティキュレーションが追加されます。なので stem_direction: 1 か、省略されたノートに対して4を指定します。

　そんなところですね。

　

VexFlow 使い方に戻る。